<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>双飞翼布局</title>
</head>
<style>
  body{
    margin:0;
  }
  .container {
    height: 100vh;
    min-width: 400px;
  }

  .middle{
    float: left;

    width: 100%;
    height: 100%;
  }

  .middle-inner{
    margin-left: 100px;
    margin-right: 200px;
    height: 100%;
    background: lightgreen
  }

  .left {
    float: left;
    margin-left: -100%;

    width: 100px;
    height: 100%;
    background-color: tomato;
  }

  .right{
    float: left;
    margin-left: -200px;

    width: 200px;
    height: 100%;
    background-color: gold;
  }
</style>

<body>
  <div class="container">
    <div class="middle">
      <div class="middle-inner"></div>
    </div>
    <div class="left"></div>
    <div class="right"></div>
  </div>
</body>

</html>